Filter



FIG. 1 is a top right perspective view showing filter, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a side view thereof; and,

FIG. 7 is an opposite side view thereof.

The broken lines and all areas adjacent to solid lines depict portions of the filter that form no part of the claim. 

CLAIM The ornamental design for a filter, as shown and described. 